Sony NW-A1000 / NW-A1200 Service Manual ▷ View online
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2-2. Wake-up operation (the internal operation of Power Control IC9001)
Fig.2-1 shows the internal block diagram of Power Control IC9001.
1. System Controller Circuit inside IC9001
When any of the input signals to pin-40 [WAKE0] through pin-46 [WAKE6] of Power Control IC9001 changes from “H” to “L”, the system controller section inside IC9001
wakes up and the WAKE(INT) signal is supplied to the internal circuit of IC9001 from the system controller section. When IC9001 enters the wake-up mode, the VREF
GENERATOR circuit inside IC9001 starts up, and the reference voltage (VREF voltage: +2.4 [V]) is generated and output from pin-36 [VREF].
The “wake-up conditions” of the model are shown in Table 2-3.
1. System Controller Circuit inside IC9001
When any of the input signals to pin-40 [WAKE0] through pin-46 [WAKE6] of Power Control IC9001 changes from “H” to “L”, the system controller section inside IC9001
wakes up and the WAKE(INT) signal is supplied to the internal circuit of IC9001 from the system controller section. When IC9001 enters the wake-up mode, the VREF
GENERATOR circuit inside IC9001 starts up, and the reference voltage (VREF voltage: +2.4 [V]) is generated and output from pin-36 [VREF].
The “wake-up conditions” of the model are shown in Table 2-3.
Table.2-3 Wake-up conditions
Input Terminal
Wake-up Condition
IC9001 Pin-40 [WAKE0]
When any of keys other than HOLD Key on the unit is pressed
IC9001 Pin-41 [WAKE1]
When DCIN_5V voltage is supplied from AC power adapter. (When Pin-64 [XDCIN_DET] of IC9001 becomes “GND”.)
IC9001 Pin-42 [WAKE2]
When VBUS voltage is supplied from PC. (When Pin-65 [XVBUS_DET] of IC9001 becomes “GND”.)
IC9001 Pin-43 [WAKE3]
Not used.
IC9001 Pin-44 [WAKE4]
Not used.
IC9001 Pin-45 [WAKE5]
When any of keys on the optional remote controller is pressed.
IC9001 Pin-46 [WAKE6]
Not used.
2. 1.10V Generator Circuit (Step-down DC-DC CONVERTER -1)
When IC9001 enters the wake-up mode and the WAKE(INT) signal is output from the system controller section, the Step-down DC-DC CONVERTER Circuit-1 inside
IC9001 starts up. This circuit is a step-down DC-DC converter circuit consisting of L9002, C9004 and the step-down circuit inside IC9001. This circuit operates as follows.
The step-down DC-DC converter circuit-1 controls the duty ratio of the PWM waveform which is output from pin-1 [VO1], with monitoring the voltage input to pin-16 [FB1] of
IC9001. By this operation, the step-down circuit works, and the 1.10V voltage (1.10 [V]) is generated.
IC9001 starts up. This circuit is a step-down DC-DC converter circuit consisting of L9002, C9004 and the step-down circuit inside IC9001. This circuit operates as follows.
The step-down DC-DC converter circuit-1 controls the duty ratio of the PWM waveform which is output from pin-1 [VO1], with monitoring the voltage input to pin-16 [FB1] of
IC9001. By this operation, the step-down circuit works, and the 1.10V voltage (1.10 [V]) is generated.
3. 1.8V Generator Circuit (Step-down DC-DC CONVERTER -2)
When IC9001 enters the wake-up mode and the WAKE(INT) signal is output from the system controller section, the Step-down DC-DC CONVERTER Circuit-2 inside
IC9001 starts up. This circuit is a step-down DC-DC converter circuit consisting of L9003, C9006 and the step-down circuit inside IC9001. This circuit operates as follows.
The step-down DC-DC converter circuit-2 controls the duty ratio of the PWM waveform which is output from pin-2 [VO2], with monitoring the voltage input to pin-17 [FB2] of
IC9001. By this operation, the step-down circuit works, and the 1.8V voltage (1.8 [V]) is generated.
IC9001 starts up. This circuit is a step-down DC-DC converter circuit consisting of L9003, C9006 and the step-down circuit inside IC9001. This circuit operates as follows.
The step-down DC-DC converter circuit-2 controls the duty ratio of the PWM waveform which is output from pin-2 [VO2], with monitoring the voltage input to pin-17 [FB2] of
IC9001. By this operation, the step-down circuit works, and the 1.8V voltage (1.8 [V]) is generated.
4. 1.3V Generator Circuit (1.3V Regulator Circuit)
When the 1.8V voltage generated by IC9001 is input to pin26 [LD1IN] and supplied to +1.3V Regulator circuit inside IC9001, 1.3V voltage is generated and output from
pin-29 [LDO1OUT] to the unit.
pin-29 [LDO1OUT] to the unit.
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Fig. 2-2 Internal Block Diagram of Power Control IC9001
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5. 3.3V Generator Circuit (Step-down DC-DC CONVERTER -3)
When IC9001 enters the wake-up mode and the WAKE(INT) signal is output from the system controller section, the Step-down DC-DC CONVERTER Circuit-3 inside
IC9001 starts up. This circuit is a step-down DC-DC converter circuit consisting of L9004, C9008, C9040 and the step-down circuit inside IC9001. This circuit operates as
follows. The step-down DC-DC converter circuit-3 controls the duty ratio of the PWM waveform which is output from pin-3 [VO3], with monitoring the voltage input to pin-18
[FB3] of IC9001. By this operation, the step-down circuit works, and the 3.3V voltage is generated and supplied to the unit as 3.3V, 3.3V_HDD and 3.3V_A voltage.
IC9001 starts up. This circuit is a step-down DC-DC converter circuit consisting of L9004, C9008, C9040 and the step-down circuit inside IC9001. This circuit operates as
follows. The step-down DC-DC converter circuit-3 controls the duty ratio of the PWM waveform which is output from pin-3 [VO3], with monitoring the voltage input to pin-18
[FB3] of IC9001. By this operation, the step-down circuit works, and the 3.3V voltage is generated and supplied to the unit as 3.3V, 3.3V_HDD and 3.3V_A voltage.
One Point:
A voltage value of 3.3V voltage changes depending on the operation mode shown in Table.2-4. As shown in Table.2-4, when HDD turns OFF, the step-down DC-DC converter
circuit-3 generates 3.1 [V] to realize lower power consumption.
circuit-3 generates 3.1 [V] to realize lower power consumption.
Table.2-4 3.3V voltage
Voltage Name
HDD ON
HDD OFF
Remark
3.3V
3.3[V]
3.1[V]
PLD IC8001 controls the output voltage with a serial communication between IC8001 and IC9001.
6. 3.0V Generator Circuit (3.0V Regulator Circuit)
When 3.3V voltage generated by IC9001 is input to pin-27 [LD2IN] and supplied to +3.0V Regulator circuit inside IC9001, 3.0V voltage is generated and output from pin-30
[LDO2OUT] to the unit.
[LDO2OUT] to the unit.
One Point:
In this unit, 1.10V is supplied to 3.0V line via D9004 until the 3.0V voltage is generated for the start-up of PLD IC8001.
7. 5.0V Generator Circuit (Step-up DC-DC CONVERTER -4)
7. 5.0V Generator Circuit (Step-up DC-DC CONVERTER -4)
When 3.0V voltage generated by IC9001 is input to pin-7 [DCOC4EN], the Step-up DC-DC CONVERTER Circuit-4 inside IC9001 starts up. This circuit is a step-up DC-DC
converter circuit consisting of L9001, D9003, C9019 and the step-up circuit inside IC9001. This circuit operates as follows. The step-up DC-DC converter circuit-4 controls
the dutyt ratio of the PWM waveform which is output from pin-5 [VO4], with monitoring the voltage input to pin-19 [FB4] of IC9001. By this operation, the step-up circuit
works, and the 5.0V voltage is generated and supplied to the unit.
converter circuit consisting of L9001, D9003, C9019 and the step-up circuit inside IC9001. This circuit operates as follows. The step-up DC-DC converter circuit-4 controls
the dutyt ratio of the PWM waveform which is output from pin-5 [VO4], with monitoring the voltage input to pin-19 [FB4] of IC9001. By this operation, the step-up circuit
works, and the 5.0V voltage is generated and supplied to the unit.
8. VSTBY voltage
IC9001 has the reference voltage circuit and generates BG1 (+2.8[V]), BG2 (+1.4[V]) and BG3 (+0.6[V]). When IC9001 is in the sleep mode, BG1 voltage is output from
pin-37 [VSTBY]. When IC9001 is in the wake-up mode, 3.0V voltage is output from pin-37 [VSTBY].
One Point:
In this unit, BG1 (+2.8[V]), BG2 (+1.4[V]) and BG3 (+0.6[V]) are generated in the sleep mode.
9. XRST3 signal
9. XRST3 signal
After IC9001 wakes up, 3.3V voltage is input to RESET-3 circuit inside IC9001. When 3.3V voltage is input to RESET-3 circuit, the pin-51 [XRST3] terminal of IC9001
becomes “Open” state after the capacitive delay (about 5.6 [ms]) of C9012 that is externally connected to pin-54 [CRST3]. Then 3.3 voltage is supplied as the master reset
signal, XRST, via the pull-up resistor, R6054. About the detail of Reset Circuit, refer to “2-5. Reset Circuit” on page 15.
becomes “Open” state after the capacitive delay (about 5.6 [ms]) of C9012 that is externally connected to pin-54 [CRST3]. Then 3.3 voltage is supplied as the master reset
signal, XRST, via the pull-up resistor, R6054. About the detail of Reset Circuit, refer to “2-5. Reset Circuit” on page 15.
IC9001 has three reset circuits, RESET-1, RESET-2 and RESET-3. But in this unit, both RESET-1 and RESET-2 are not used.
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10. MAIN SYSTEM CONTROLLER IC6005
The main system controller IC6005 starts up when 1.10[V] and 3.0[V] are supplied and the reset releasing signal (“H”) is supplied. And also PLD IC8001 starts up
when 1.8[V] and 3.0[V] is supplied and the reset releasing signal (“H”) is supplied.
When Main System Controller IC6005 starts up, the timing generator circuit inside IC6005 starts the operation and X6001 starts oscillating. Then, the clock, 256fs
(11289.6[kHz]) is supplied to PLD IC8001 and IC8001 starts operation. And also, when IC6005 starts up, IC6005 downloads a firmware program from Flash Memory IC7002
with the data bus interface.
The main system controller IC6005 starts up when 1.10[V] and 3.0[V] are supplied and the reset releasing signal (“H”) is supplied. And also PLD IC8001 starts up
when 1.8[V] and 3.0[V] is supplied and the reset releasing signal (“H”) is supplied.
When Main System Controller IC6005 starts up, the timing generator circuit inside IC6005 starts the operation and X6001 starts oscillating. Then, the clock, 256fs
(11289.6[kHz]) is supplied to PLD IC8001 and IC8001 starts operation. And also, when IC6005 starts up, IC6005 downloads a firmware program from Flash Memory IC7002
with the data bus interface.
= Technical Tip =
It can be judged whether IC9001 is in the wake-up mode or in the sleep mode by checking the output voltage at pin-37 [VSTBY] of IC9001. (TEST Point: TP9018)
During sleep mode: 2.8[V] (BG1 voltage)
During wake-up mode: 3.0[V] (LDO2 (3.0V) voltage)
During sleep mode: 2.8[V] (BG1 voltage)
During wake-up mode: 3.0[V] (LDO2 (3.0V) voltage)
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